A block of mass m = 10 kg is attached through a rope to a uniform solid disk of radius R = 0.2 m and mass M = 5 kg free to rotate around an axle through its center of mass. The block is initially held by hand and then released. What is the tension in the rope as the mass m descends?

Aprotein molecule in an electrophoresis gel has a negative charge. the exact charge depends on the ph of the solution, but 30 excess electrons is typical. what is the magnitude of the electric force on a protein with this charge in a 1600n/c electric field? write in two significant numbers, and also in newton